(PhysOrg.com) -- Imagine sitting around a conference table with several of your colleagues as you hold an important meeting. Now imagine your boss pulling out what looks like a radar gun for catching speeding motorists and aiming at any of you that speak to long, very nearly instantly causing whoever is speaking to start stuttering then mumbling and then to stop speaking at all. That’s the idea behind the SpeechJammer, a gun that can be fired at people to force them to stop speaking. It’s the brainchild of Koji Tsukada and Kazutaka Kurihara, science and technology researchers in Japan. They’ve published a paper describing how it works on the preprint server arXiv.

The idea is based on the fact that to speak properly, we humans need to hear what we’re saying so that we can constantly adjust how we go about it, scientists call it delayed auditory feedback. It’s partly why singers are able to sing better when they wear headphones that allow them to hear their own voice as they sing with music, or use feedback monitors when onstage. Trouble comes though when there is a slight delay between the time the words are spoken and the time they are heard. If that happens, people tend to get discombobulated and stop speaking, and that’s the whole idea behind the SpeechJammer. It’s basically just a gun that causes someone speaking to hear their own words delayed by 0.2 seconds.

To make that happen, the two attached a directional microphone and speaker to a box that also holds a laser pointer and distance sensor and of course a computer board to compute the delay time based on distance from the speaker. To make it work, the person using it points the gun at the person talking, using the laser pointer as a guide, then pulls the trigger. It works for distances up to a hundred feet.

The two say they have no plans to market the device, but because the technology is so simple, it’s doubtful they could patent it anyway. The idea though is likely to spread like wildfire. Surely it won’t be long before Oscar winners are jammed instead of herded offstage by increasing the music volume. Or hecklers in a crowd silenced at a moment’s notice. And just as surely human rights advocates will decry the use of such a device by politicians or government leaders, just as consumers will demand a much smaller version that will allow them to silence people that annoy them from afar, anonymously.

And after that, new laws will have to be written to govern their use, of course, because no matter how much people would like to force others to shut up, they’ll hate it just as much it when it’s pointed at them.

AbstractIn this paper we report on a system, "SpeechJammer", which can be used to disturb people's speech. In general, human speech is jammed by giving back to the speakers their own utterances at a delay of a few hundred milliseconds. This effect can disturb people without any physical discomfort, and disappears immediately by stop speaking. Furthermore, this effect does not involve anyone but the speaker. We utilize this phenomenon and implemented two prototype versions by combining a direction-sensitive microphone and a direction-sensitive speaker, enabling the speech of a specific person to be disturbed. We discuss practical application scenarios of the system, such as facilitating and controlling discussions. Finally, we argue what system parameters should be examined in detail in future formal studies based on the lessons learned from our preliminary study.

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surely this could be a mobile phone app, shut the frase up! i wonder if some sneaky people in the audience will use it to disrupt one of the candidates in a presidential debate to make him/her look insecure...

Since I don't like to hear people loudly talk about the gruesome details of their dates of the previous evening, the quality of their bowel movements or a hundred other "oversharing" topics people chat about on the cellphone when on the bus, I would certainly welcome this...

Also, we need an automated version: Teenagers who are chronically unable to express themselves without using verbal tics such as "like" or "f*ck" or "man" every five seconds should have a unit cuffed to the arm and triggered by cue words until they manage to express themselves reasonably coherently :-)

Trouble comes though when there is a slight delay between the time the words are spoken and the time they are heard. If that happens, people tend to get discombobulated and stop speaking, and thats the whole idea behind the SpeechJammer. Its basically just a gun that causes someone speaking to hear their own words delayed by 0.2 seconds.

So you can beat it with practice. Can't wait to see the look on that boss' face when you just keep talking as though his little mind-control toy only worked on him.

Uh, come on folks, this isn't a bad device unless you have an IQ of 1. Anyone who wants to keep on talking will keep on talking, and it doesn't take much brain power to get past something like this. After the initial shock the speaker will immediately start to adapt to what's going on and nothing will change. It's not a weapon against free speech, it's a high school science project.

Yeah, and they will come up with a portable infrasonic projector. Making the whole audience feel creepy about what the speaker is saying, and the speaker feel nauseous and uneasy about what he is mouthing. Infrasonic does not care whether you have earplugs or not. The whole body is the conductor due to the longer wavelength.

I ts funny I just went through a config setup for my voice to text and it has maybe a 200ms delay in the audio playbaco at one point. At first it is very disturbing and reappy upsets your talking. You do get used to it fast but even then your peach is very ddisjoimted or hesitant even when concentrating. This uses a pre written paragraph to read so i wonder how well his would work with unreferenced normal speach. Definitely have to build one.:-)